Purge sector – no air mixing between air flows

2020-08-27

All the actualities we are facing today raises doubts about rotary heat exchanger working principles – does it spreads viruses or other microorganisms within ventilated premises and whether it is riskier if compared with plate or counter flow recuperators. It is true that a small amount of the extracted air (up to 1%) does not manage to leave the rotary wheel channels, during its rotation, and may be sucked into the supply flow. Although such a slight air mixing does not have a significant impact on ventilation efficiency or transmission of pathogens, even one percent of mixed air in rotary heat exchangers is not acceptable, when the requirements for indoor air quality are particularly strict. One of the most effective solutions to reduce air mixing inside of the rotary exchanger is the purge sector – an additional specially designed part that mounts on to the rotary wheel housing at the airflow-dividing panel. The purge sector covers the area of the rotary wheel between the extract and supply air flows in a way that part of the fresh air is exhausted together with the air from the premises, thus extracted air returning to the supply is reduced even to 0.1%. The trustworthiness of such technical solution and declared air mixing percentage (0.1%) are confirmed by laboratories in Switzerland.

Purge sector is available for whole VERSO and KLASIK range with rotary exchangers, except false ceiling models.

Additional help for the purge sector is also available. By the relatively increasing speed of the exhaust fan over the supply fan, a pressure difference inside of the AHU is created, that eliminates the return of extract air to the supply flow.

It is worth mentioning, that internal air leakage inside the AHU creates even higher risk of increased air mixing and must be avoided. Typically, internal air leaks are caused by improperly balanced airflows, poor quality sealing materials, or its wear and tear. Advanced technologies and high-quality materials used by KOMFOVENT, minimize internal air mixing of the air handling units, however, it is also important to keep in mind the proper periodic maintenance: replace worn-out gaskets or heat recovery sealing brushes in a timely manner.